U.S. EPA Contaminated Site Cleanup Information (CLU-IN)


U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Fractured Bedrock Project Profiles

Last Updated: October 29, 2010

Point of Contact:
Joseph LeMay
USEPA 5 Post Office Sq., Suite 100
Mail Code OSRR07-4
Boston MA 02109 - 39 
Tel: 617-918-1323 
Email: lemay.joe@
epa.com

Re-Solve, Inc.
North Dartmouth, MA


Hydrogeology:

The overburden consists of permeable sands and gravels ranging in thickness from less than 10 feet to approximately 28 feet. A till layer generally is found below the sands and gravels in contact with the bedrock. The till layer varies between 0 and 25 feet in thickness. Many large boulders were found in the overburden during excavation of the contaminated soils in 1994.

Targeted Environmental Media:
  • - Dense Non-aqueous Phase Liquids (DNAPLs)
  • - Fractured Bedrock

Contaminants:

An estimate of plume size from a five year review map shows a length of approximately 1,100 feet and a width at its widest of 770 feet.

Major Contaminants and Maximum Concentrations:
  • - Acetone (37,000 µg/L)
  • - Tetrachloroethene (14,000 µg/L)
  • - Trichloroethene (50,000 µg/L)
  • - 1,2-Dichloroethene (83,000 µg/L)
  • - 1,1,1-Trichloroethane (35,000 µg/L)
  • - Vinyl chloride (8,000 µg/L)
  • - Methylene chloride (16,000 µg/L)
  • - 2-Butanone (MEK) (62,000 µg/L)
  • - 2-Pentanone (6,800 µg/L)
  • - Toluene (33,000 µg/L)

Site Characterization Technologies:

No technologies selected.


Remedial Technologies:

  • - Pump and Treat
Comments:
Monthly average pumping rates for the eight extraction wells have consistently been maintained at the target of 48 gpm since November 1999. Dissolved contaminants have a downward trend. Bedrock monitoring wells continue to have concentrations of chlorinated solvents in the tens of thousands ug/L.
Remediation Goals:

5 ug/L for TCE, methylene chloride, and PCE. MCLs for lead, vinyl chloride, p-dichlorobenzene, and 1,1-dichloroethene.


Status:

Bedrock monitoring wells continue to have concentrations of chlorinated solvents in the tens of thousands ug/L.

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For more information on Fractured Bedrock, please contact:

Ed Gilbert
Technology Assessment Branch

PH: (703) 603-8883 | Email: gilbert.edward@epa.gov